Ported carboy vs. siphoning?The spigot for the port is very easy to remove. I remove it after every batch, clean it, and allow all parts to dry. I'll sanitize and reassemble just before adding the next batch of wort.

My keg is empty. Now what?I also leave the kegs under a touch of pressure; that way I know if any of the seals are bad when I come back, and I know nothing has gotten in. Otherwise, I agree: keep the kegs cleaned and ready to go.